Lewis Terman, in full Lewis Madison Terman (born January 15, 1877, Johnson county, Indiana, U.S.—died December 21, 1956, Palo Alto, California), American psychologist who published the individual intelligence test widely used in the United States, the Stanford-Binet.

Terman joined the faculty of Stanford University in 1910, where he became professor of education in 1916, the year he published The Measurement of Intelligence, a guide for his Stanford revision and enlargement of the earlier Binet-Simon intelligence scale developed in France. Scoring on the test was signified by the intelligence quotient, or IQ, which takes account of both chronological age and mental age so that the average child of any age has an IQ of 100.

During World War I Terman contributed to developing the first notable mass-group intelligence testing in the U.S. Army Alpha and Beta programs. He became professor of psychology at Stanford in 1922, remaining there until he retired in 1942. In 1921 he launched a comprehensive long-term program for the study of the gifted. The subjects, 1,528 California children with IQs exceeding 140, were examined medically, anthropologically, and psychologically and were described otherwise in terms of interests, scholastic achievement, books read, and games known. He continued this research until his death 35 years later, by which time he had obtained definitive evidence that gifted children tend to be healthier and more stable than the average.

Findings from the study, which was projected to continue until about 2010, were first reported in Terman et al., Genetic Studies of Genius, 5 vol. (1926–59). Terman’s successors continued to publish books on the longitudinal study that Terman began in the first half of the 20th century. Terman’s other investigations were reported in Sex and Personality (1936) and Psychological Factors in Marital Happiness (1938).

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Psychologists in the United States very quickly adopted Binet’s tests and modified them for American use. More than that, they reinterpreted the results to be clear evidence of innate intelligence. Lewis Terman and his colleagues at Stanford University developed the Stanford-Binet IQ (intelligence quotient) test, which set the standard for similar tests produced by other American...

...should measure skills such as judgment, comprehension, and reasoning—the same kinds of skills measured by most intelligence tests today. Binet’s early test was taken to Stanford University by Lewis Terman, whose version came to be called the Stanford-Binet test. This test has been revised frequently and continues to be used in countries all over the world.

...to determine exactly what intelligence is. Different investigators have emphasized different aspects of intelligence in their definitions. For example, in a 1921 symposium the American psychologists Lewis M. Terman and Edward L. Thorndike differed over the definition of intelligence, Terman stressing the ability to think abstractly and Thorndike emphasizing learning and the ability to give good...